Following a discussion of various forms of set-theoretical foundations of category theory and the controversial question of whether category theory does or can provide an autonomous foundation of mathematics, this lecture concentrates on the question whether there is a foundation for “unlimited” or “naïve” category theory. I proposed four criteria for such some years ago. This lecture describes how much had previously been accomplished on one approach to meeting those criteria, then takes care of one important obstacle that had been met in that approach, and finally explains what remains to be done if one is to have a fully satisfactory solution.